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AX3203
150KHz, 5A PWM Buck DC/DC Converter
AX3203 Series
Description
The AX3203 is Monolithic IC that design for a step-down DC/DC Converter, and own the ability of driving a 5A load without additional transistor component. The output version included 3.3V, 5V, 12V and an adjustable type. It operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch.
TO220-5L Package
1 2 3 4 5
Features
• 3.3V, 5V, 12V and adjustable • Adjustable version output voltage range: 1.3-37V • ±4% max over line and load conditions • 150KHz ±15% fixed switching frequency • TTL shutdown capability • Operating voltage can be up to 40V • Output load current: 5A • TO220-5L and TO263-5L packages • Low power standby mode • Thermal-shuntdown and current-limit protection • High efficiency • Built-in switching a transistor on chip, requires only 4 external components
TO263-5L Package
1 2 3 4 5
Applications
• Simple High-efficiency step-down regulator • Positive to negative converter • On-card switching regulators
Connection Diagrams
TO220-5L Pins 1,3,5 Side View Pins 2,4 Side View 5 - On/Off 4 - Feed Back 3 - Ground 2 - Output 1 - VIN Metal Tab GND TO263-5L
Top View Metal Tab GND
5 - On/Off 4 - Feed Back 3 - Ground 2 - Output 1 - VIN
Top View
AVANTICS - AX3203 Series
Specification No.: 050310-FE0010
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Pin Connections
SD VIN Current Source Bias
+ + 220mV R
1.235V Reference
2.5V Regulator
Start Up
200mV
+ COMP Current
Limit
FB
R2
+ AMP + COMP COMP + 150KHz OSC.
COMP +
5A Switch
Driver Thermal Limit
R1=2.5K
Output GND
Absolute Maxium Rating
Parameter Supply Voltage On/Off Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Operating Temperature Storage Temperature Operating Voltage Human Body Model
(Note1)
Symbol VCC VSD VFB VOUT PD Topr Tstg VOP
(Note 2)
Value 40 -0.3~+25 -0.3~+25 -1 Internally Limited -40~+125 -65~+150 +4.5~+40 2000
Unit V V V V W
o o
C C
V V
Electrical Characteristics (Continued)
Specifications with boldface type apply over for full operating temperature range, the other type are for TJ=25oC
Part No.
Parameter Output Voltage Efficiency
Symbol VOUT η VOUT η VOUT η VOUT η
Conditions 4.75V≤VIN≤40V, 0.2A≤ILOAD≤5A VIN=12V, ILOAD=5A 7V≤VIN≤40V, 0.2A≤ILOAD≤5A VIN=12V, ILOAD=5A 15V≤VIN≤40V, 0.2A≤ILOAD≤5A VIN=25V, ILOAD=5A 4.5V≤VIN≤40V, 0.2A≤ILOAD≤5A VOUT programmed for 3V VIN=12V, VOUT=3V, ILOAD=5A
Min. 3.168 3.135 4.800 4.750 11.52 11.40 1.193 1.180 -
Typ. Max. (Note3) (Note4) 3.3 71 5.0 78 12.0 88 1.23.